碱浸氧化锌矿中硅的浸出动力学

Leaching Silicon Kinetics of Zinc Oxide Ore Leached with Alkali

摘要: 研究了难选异极矿型氧化锌矿氢氧化钠浸出过程中Si的浸出动力学。考察了浸出反应温度、氢氧化钠初始浓度对异极矿型氧化锌矿中Si的浸出速率的影响。并利用等浸出率法来确定浸出过程的控制步骤。结果表明, 浸出反应表观活化能E =72.58 kJ/mol, 属于化学反应控制; 其反应级数K=4.57。提高氢氧化钠的浓度、反应温度, 均可加速Si的浸出, 提高Si的浸出率。

Abstract: The kinetics research of leaching silicon from the refractory hemimorphite leached with alkali was investigated.The effect of reaction temperature, concentration of sodium hydroxide on the leaching process was studied by obtaining the apparent activation energy and reaction progressions.The result showed that the apparent activation energy was determined to be about 72.58 kJomol-1, and the leaching rate was controlled by the surface chemical reaction.The reaction progression is 4.57.Enhancing the density of the sodium hydroxide, agitation rate and the temperature would accelerate the speed of silicon leaching and raise the leaching rate.